depthcomponentfloatretained.java

JAVA3D矩陈的相关类

/*
 * $RCSfile: DepthComponentFloatRetained.java,v $
 *
 * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
 *
 * Use is subject to license terms.
 *
 * $Revision: 1.4 $
 * $Date: 2007/02/09 17:17:57 $
 * $State: Exp $
 */

package javax.media.j3d;


/**
 * A 2D array of depth (Z) values in floating point format in the range [0,1].
 * A value of 0.0 indicates the closest Z value to the user while a value of
 * 1.0 indicates the farthest Z value.
 */

class DepthComponentFloatRetained extends DepthComponentRetained {
    float depthData[];

    /**
     * Constructs a new floating-point depth (z-buffer) component object with 
     * the specified width and height.
     * @param width the width of the array of depth values
     * @param height the height of the array of depth values
     */
    void initialize(int width, int height) {
        type = DEPTH_COMPONENT_TYPE_FLOAT;
        depthData = new float[width * height];
	this.width = width;
	this.height = height;
    }

    /**
     * Copies the specified depth data to this object.
     * @param depthData array of floats containing the depth data
     */
    void setDepthData(float[] depthData) {
	int i;
	for (i = 0; i < depthData.length; i++)
	    this.depthData[i] = depthData[i];
    }


    /**
     * Copies the depth data from this object to the specified array.
     * @param depthData array of floats that will receive a copy of
     * the depth data
     */
    void getDepthData(float[] depthData) {
	int i;
	for (i = 0; i < this.depthData.length; i++)
	    depthData[i] = this.depthData[i];
    }

    /*
     * retrieve depth data from input buffer
     */
    final void retrieveDepth(float[] buf, int wRead, int hRead) {
        int srcOffset, dstOffset, i;
 
	// Yup -> Ydown
        for (srcOffset = (hRead - 1) * wRead, dstOffset = 0,
                i = 0; i < hRead; i++,
             srcOffset -= wRead, dstOffset += width) {

            System.arraycopy(buf, srcOffset, depthData, dstOffset, wRead);
        }
    }
}